Improvement in slow-closing compression-cocks



M. S. CLARK.

SLOW-CLOSING COMPRESSION COCK.

Patented my 9,1876.

Wmmsws. l/vf UNITED STATES PATENT OFFICE. I

MINEORD s. CLARK, 0E NEW YORK, N. Y., AssiGNoR-fro oHA'RLEs-j EARRIsoN,oE SAME PLACE.

`IMPROVIVl-ENT IN SLOW-CLOSlNG COMPRESSlON-COCKS.

Specification forming part of Letters' Patent No.*l77,095, dated May 9,1876-; application lled December 2, 1875.

. plugis raised by atmospheric pressure when the plunger is raised byits loperating-screw, and as' the fluid makes its way into the recess ofthe plunger, the `loose plug f'alls by its own weight until it engagesthe valve-seat, whereon it is held by the waterpressure.

In operating this class of' compression-cocks the stem .is first turnedin one direction t0y force the main plunger down, so as to lcompletelyenvelop the loose plug, and is then turned the other way, to elevate theplunger and loose plug together.

My invention consists in the combination' f of' the plunger with anadjusting-screw, t'or regulating the operationof' the plunger bystopping it at prescribed points. My improvement makes the structure anadjustable sel'fclosing valve. The higher the plunger is elevated thelonger it takes for the loose`plug to move down to the valve-seat, andof course the longer the water continues to flow through the valve. .v

In the accompanying drawings, Figure l represents-a vertical section ofmy improved compression-cock, through the center of thev valve-chamber,and the'induction and eduction passages. Fig. y2 is a similar verticalsection of the valve-chamber, showing the plunger and. loose plugelevated. Fig. 3 is.

an elevation, partly in section, showing the screw-thread on theplunger.

Theinduction-passage a communicates with the bottom of' thevalve-chamber b, which has the central outlet c provided with the raisedvannular valve-seat d, through which liquid is discharged into thenozzle e of' the cock. The

plunger fis elevated and vdepressed by the` usual ways.

In the drawing the plunger is represented as havingztwo malescrew-threads,f1 and f2, upon its periphery, which engage correspondingfemale th reads f3 and f4,formed in the walls'of'the valve-chamber. Theplunger is provided with a cylindrical recess, h, which containstheloosefitting cylindrical plug, i, provided at its outer or lower endwith the elastic washer i. rIhe upper end of' the plunger is providedwith the square stem K, which is engaged by the corr-espondingly-shapedlrecess K', inthe lower end of they valve-stem. low, for the purpose ofcontaining the adjusting-screw l, the lower end of which engages theupper end of' a loose piri, ll, contained in the lower part otl theopening-in thevalve-stem. The lower end of' the pin l* is provided withthe' annular washer l2, which engages the iuterior wall ofthe hollowvalve-stem, and makes a tight joint, f'or the purpose of` preventing theescape of' fluid from the valve-chamber into and through the hollowvalve-stem. The lower-end ot the pin l1 engages the upper end of theplunger-stem K, and acts as a stop,

whichdetermines the distance to which theV plunger' can be elevated,

rlhe operation of my compression-cock 1s as follows: The parts being inthe position show n in Fig. l, the stem is turned from right to left,which depresses the plunger, so, that it completely in'closes the looseplug. The Y stem is then turnedback from lef't to right, which elevatesthev plunger, and at the same time elevates the loose plug byatmospheric pressure, theparts thenk assuming the posi- Ation indicatedin Fig. 2.k In this position the fiuid gradually makes its way aroundthe periphery of' the loose plug into. the recess in The valve-stem isholthe amount of upward movement of the plum. tially as" described, incombination Witllhll d rger, andcconseqilently.of fthe `loose plugfisi`tdjl'lstbleistop"lforthemiupoeelof;regulating g perfectly controlled,and thereforeithe time the height to which then-plunger fri-iid Aloose``required for the dropping` of'` the loose plug is` plugean be elevated,and thus `determining g.

accurately regulated. By thismeansthe'quans the-time takeuifor theclosing of theyalve, f tityof uid discharged through the cock by andgoverniugthe quantity f` waterfdisf one movement of the @mm lmayibwavid.ati fchargcdbyfthe wahre:

" pleasure. i MINFORD" S. CLARK. "I claim as my invention-' 4"VVtnesses: l

In a self-closing compression-emma pluul W. P. TOWNE, d gerreeseditofeontainwlooslplugzisubstan-l d H Boom

